Belt



A. O RUTZ. BELT.

- APPLICATION FILED JUNE 20,1918. gl zigg ggg PatentedSept. 19, 1922.,

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BELT. APPLICATION FILED JUNE 20.1918.

Patented. Sept. 19, 11922.,

2 SHEETS-SHEET 2.

Patented Sept. 19, IQZZ.

Eran stars meant earner earn-ea,

ARNOLD O. RUTZ, OF MILWAUKEE, WIS( JOIN'SIN ASSIGNOR TO MILWAUKEE GAS SPECIALTY COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WIS- CON SIN.

, BELT.

Application filed June 20, 1918. Serial No. 240,987.

To all whom it may concern:

Be it known that I, ARNOLD 0. Burn, citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Belts, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification,

My invention relates to the transmission of power and has special'reference to power transmission belts. I

Generally, the object of my invention is to provide a power belt, which shall be more enduring,more eflicient, easier applied, and which shall have more perfect contact. with the pulley faces. 1

A further object of my invention is to in the production of belts of any desired power capacity, to provide a relatively heavybelt at low cost, which shall conform accurately to the belt 'surfaceof crowned pulleys and which shall prevent the formation of air pockets between the belt and pulley.

My invention provides a'power belt made up of relatively short or :narrow sections which extend across the belt, these sections being made up of one or more pieces arranged end to end and a suflicient number of these sections strung on a plurality of parallel coiled springs long enough to ex tend through the belt from end to end and having their respective ends coupled together to make the belt endless.

Several features of my invention relate to improvements in the means for coupling the ends of the longitudinal tension springs and others relate to the use. of pre-formed sections, curved to fit crowned pulleys.

My invention also consists in the several combinations and arrangements of parts and in the features of construction by which I am enabled to attain the above mentioned and other objects, and all as hereinafter demake use of relatively small pieces of leather.

scribed and particularly pointed out in the appended claims.

My invention will be more readily understood by reference to the accompanying drawings in which- I Figure 1 is a fragmentary view in per- 'spective of a partially unrolled coil of belting, illustrating a preferred form of my invention;

Figures 2 and 3 are views in elevation, particularly showing the form that my improved belt takes when applied to a pulley of relatively small diameter and relatively high crown;

Figure 4 is a fragmentary plan view of the belt illustrating the means for connecting the ends of the belt together;

Figures 5 and 6 are views in elevation, particularly illustrating one form of; con-' nector' forthe ends of the tension springs;

Figures '7 and 8 are similar views showing another form of connector;

Figure 9 is a centralv longitudinal sectional view of a swivel form of connector;

Figures 10 and 11 are side elevations of another form of connector;

Figure 12 is a side elevation, partly in section of still another form of connector; and

Figure 13 is a v'iewin elevation of a-tool for use in assembling the parts of my improved belt,

I am aware that belts of the general character disclosed herein have been proposed, but so far as I have been informed, no one has heretofore proposed or suggested to form the transverse leather elements of more than one piece,- nor to pre-curve the leather sections to it crowned pulleys, nor to provide spring connectors of the improved form shown. 1

.Myimproved belt consists of a plurality of substantially endless longitudinally extending springs or tension members 10, to take the pull of the belt, and transversely arranged and extending pulley contacting and wearing members 11 carried by the tenscrewed;"or threaded into'th'e end of 'lthe sion members and preferably arranged norsubstantiallya' contact with the; pulley 12 together. The pin 19 is preferably passed through the several connectors as shown and may be retained in position by riveting the ends as shown in Figure 4c or in any other suitable manner.

The. threaded connection illustrated in Figuresb and .6 is of such a relative .diameterthatthe endv of the spring-.coil is en- The tension springs 10 are proportioned larged as it is threaded thereupon. This as to size ofwire, size of coil and number serves to produce such a. firm grip between of springs used, 'to'producea beltof sucl1""the spring and'the threaded stem--that-the a strength that thebelt will properly"trans--" spring is heldfir'mly thereon; eventhough mit the required quantity of power withthe stem is of a length to receive-buttwo or out undue tension being imposed on the""thi"ee of the turns of the spring. springs. In. Figures?- as I have illustrated an In roviding belts for use with crowned other method of causing the holding grip pulleystI may curve the=leathersections v1L between the springiand.thestem,-that=is,-by\; as shown at 0, Figure 3, sothat theyi will making thethread-QO on thestemzofvr greateir pitch' thani-rrthe pitch of the" springs-so .thatb; throughoutwtheir,length,or I some times when thestemais 'screwedinto the QIId BG Oli'f find'it advantageous to makewuptbersee the'spring the coils.thereofshallibe forciblyi 85. tlOI IS: Of several SllOIlfi 1316088: as ShOWH It spneadi ap'aptsas shown in Figure 8, thushcausv b, which SllOIll DlGOBS :lesllll'i in kthe PTO:- ingia. grip-between bhgstenjandihg spring; (1110510111ofhbelh'whlch is y'q I findthatitozsecureithenbestwresults.itiis. flexible transversely of the belt and capflibl'e i necessary to;either-makewthestem4:.of a size of conforming to -'the crowned .pi lley -witn ng p mecl for this purpose of 'the stem greater. than 'the pitch. :ofthe In making 1 3 belt thei -m n spring'zfor the reasonwth-a-t in i'screwing-dthe.

I prefer :to usefew -"ifiany';leathersections stem into the spring the spnin gig made of a single piece extending across the lightly-,1: whichmtemporarilyi;-.renlarges ;.th belt from :side to side r-but to overlap the spring: -ffii ntly t mit,{h eagygntnanceefl short pieces, as shown in Figured, a SlllllGlQHl'f; of the steinsandswhen it-isxattemptedtoatake number of theshort piecesbeing-provicled the .springnoutib unscrewing it, thef-;slight,-. withholes for two or-morewof thezsprings friction inherent between thevstem andithew; and being arranged in such overlappingeor spring rcoilv;causesjethea spring toub q zig z'a'gzr'elation thatithel' several tension mem..: tractecl; uponcthe stem and"? to'ihug it with 5100. bersare properly held in 'their relative posigreatersand- .:greaterrforce themore it iSlLl3-:. tions. tempted to unscrew:thensteiniioutwofethe For connecting theendsofith'e' springwtenspring; It SlldlllCllbflindBI'StOOd thatlmakeJv sion "member together and thus making-the. the? entire conneotor=-l3fas shortyasfpossi-ble belt endlessI have providedwa novelaform from'the centerxofithe:connectingpin t.othe-10 5 of connector whichis readily and-easily con endoft'he thread-ed stem smt-hat the belt can nec-tedtovthevspring without-preliminary best conform itself at this point tobthe work on the springexceptto cut it-t onthevcurvatureofirsmall pulleys-i. V .1 proper length and which when in place can-1*. In 'Fi gureifi Ihave illustratedsa connectornot readily be removed and cannot, in fact, foretlieicoilzatension .m'ember,-iinuwhich thevl fl; become loosened; iexce-pteit 1 beintentionally" two: threaded iends l are, swivelly: joined. In. 1' done. i this iform whet-threaded members 20rforwreev Myimpro-vecl connecting device13 conceiving'the'ends ofpthe:coiled-spring tension; sists 'of "a pair-of similar connecting 'memw 'meinbe'rsrx10w-are duplicates me. each other bers 14' each of which has'a threaded end 15 Each is provided with. a central longitudinal. v.115- of-a diameter and pitch"ofthread to be hole 21;;Ethrongh=.which1 ]l threadsa'connects .1 ing wire or I'OdfiQQaii', I secure thenwire conspring 10* as'clearly shownin Figures=5 andwv IIG'Ct-OI'IQZI ini-ipl'ace'and the vtwonpartsQdto- 6. Each member'- 1 f" alsohas a shonlden 16: gether any suitable; means; :such as bend tolimit the distance whichitcan be screwed inguthe. ends .23ieofithe' wirer 22: asJ-gshow-n. 1 120.

mally substantially contacting with each other.

The wearing members are preferably made of leather and may each consist of a single piece as a, extending from side to side of the belt, or-may be made-up of. two or. more shorter pieces as shown at b.

7 into the spring, and at the oppositeend ant l/V'hilethetwo.parts 20iarethus,permanently offselr' hinge? part- 17 adaptedfon-co operaconnected.(together;itheyziare leftrfreei to -be i tion' witlr a similar' part onthdoppos'ite end threaded iinto': respective ends l of; the; coiled of the spring for connecting the -two: 'en'd's spningi tension" -'membersx: Y together;"These-hinge partsare provicleda In 1Figure" 12:.1 have. illustratedranothen 12'5. ith} re i t ri g for ti 13m. form of swivelly connected th readed'conned a connectingpini rod, orwvire -19 (F-igure1etorsi 24r a nd .-=,Q5; Theiimemben-1-124'Ezis prof 4c) for connecting the two ends of the belt vided with a ball 26 and the member 25 is to enlarge theispringor to: make.- thecpitchvztio.

provided with a socket 27 to receive and retainthe ball, and form a universal joint be]- tween the two members 24 and 25. This joint, while it holds the two members '24: and 25 permanently joined, permits the independent screwing of the members into-the coiled spring tension members. i

In Figures 10 and 11 I have illustrated a form of connector which is adapted for the independent threading of the members into the respective coiled spring tension members, and then the hooking of the connectors together; In this form the threaded member 28 is provided with a centrally arranged hook 29 and the other threaded member 30 is provided with a centrally arranged projection 31 having a central hole 32 to receive the hook 29 as best shown in Figure 11.

It is obvious that the threaded ends of these several forms of connectors can be made in any one of the several ways for providing a grip between the coiled tension member 10 and the threaded connectors;

hen the belt is in use the side which is in tension is slightly elongated, particularly if it is transmitting power anywhere near its capacity, consequently the leather sections are separated slightly from each other and as they pass around the pulley they cannot pocket the air between the belt and the pulley as is done in a solid belt for the reason that the spacing between the sections permits the air to escape, consequently this form of belt results in a maximum of frictional contact with the pulleys over which it is trained.

I find that the part of the belt occupied by the connectors 13 and not provided with transverse contact strips is not sufficient in area to materially effect the frictional contact of the belt with the pulley.

In making up the springs 10 I preferably, as illustrated, wind the coils in close con tact with each other and I preferably cut the springs of such a length in relation to the length of the belt and the relative position of the end strips of the belt that the springs are slightlyelongated or put under a tension equal to approximately one-half of the maximum driving effort or tension when the connector members 14 are screwed into place and consequently the belt as a whole is under a preliminary tension even when the leather strips are in contact with each other, and before the belt is placed in operative position upon the pulleys.

When the belt is then placed under its maximum driving tension for which it is designed, the tension will all appear upon the driving side. If it is attempted to drive a greater load, the increased tension willcause slack and loss of gripping power so that the belt will slip and limit the transmission of power to the predetermined maximum. This'is "a valuable feature. The

crowned belt shown in Figure 3 will re-" The belt may be made up in lengthsof any desired quantity as indicated in Figure land cut to desired stock sizes. The connectors shown in Figures 4; to 12 may be employed in makingconnections between short pieces to make abelt of any desired length. I

I find it highly desirable to make the belt of a minimum thickness because of the re duction in internal friction. To this end it is desirable to make the springs of small diameter and to employ a greater number in the lateral width of the belt.

For convenience in manipulating the coiled springs 10 so as to permit the easy screwing in and removal of the threaded connectors, I provide a spanner wrench 33, as shown in Figure 13. This wrench has a hooked end 34 provided with an inwardly extending projection 35 adapted to engage the free end 36 of the spring 10 (see Figures 7 and 8) in an obvious manner. By use of this wrench I am enabled to uncoil and expand the end portions of the springs 10 sufliciently to permit the insertion and removal of the threaded connectors.

I do not intend to be limited to the precise details of construction shown and described.

I claim:

1. A. power belt comprising a plurality of parallel expansible tension members, and a pulley contacting and wearing surface composed of transversely extending sections arranged side by side, some of which are composed of two or more pieces arranged end to end and having holes for receiving the tension members.

2. In a power belt a plurality of coiled spring tension members extending longitudinally of the belt, in combination with a sectional wearing surface composed of transversely arranged sections having holes for receiving the springs, and arranged on the springs in substantial contact with each other, a plurality of such sections being made up of more than one piece.

3. In a power belt, the body of the belt comprising transversely arranged leather sections relatively narrow longitudinally of the belt, the sections composed of pieces of various lengths and the pieces of successive sections arranged in overlapping relation,

said sections provided with registering openings, spring tension members extending through sald openings, and means hingedly connecting the respective ends of the ten- 1slon members together to make the belt endess.

4. In a power belt of the character desenibed, lpngitudi'nall y arranged relatively rigid" Wearing lgnemhers carried thereby, the rigld members bel ng madewnp of relatively sh0rt qseebi'ons; a1"- ranged lend to end and the: sections. of. suecessive membersmarmnged .1n -0ver1appmg, I .my name thlS; 18

relation w permit the belt towconfionm t0 crowned pullyewhemused thereon.

5. :Invn rbelt" ofiithe character described, I -a transversely extending sectional. Wearing strips, in eombinatii'oxn;wlthflav plurality: of

longitudinally; extendingpoiledjspning xten-r J I arrangedjfitensipn--- membe'i' sy 111 GOmbHIfltIOII -Wfih. transversely-T v springsjsion membersmarl rangedg Withinwvsaid tl an sverse strips, coupling members"frictionallyfw -;engaged with, the-ends 10f ,thetension mem; i Joel's, ami. means .fof hingedly fconnecting 

